A series of C80 isoprenoid 20-bis-16,16′-biphytanyl tetraacids has previously been found to be responsible for calcium naphthenate scaling in crude oil processing. This paper describes the structure elucidation by high-field NMR spectroscopy of the structures of the series of homologous C80 tetraacids containing 4–8 five-membered rings. In addition, the structures of methyl-substituted C81 and C82 analogues containing 7 and 8 five-membered rings have been determined for the first time. The biosynthetic implications are discussed.
Organic & Biomolecular Chemistry
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